diff --git a/include/signal.h b/include/signal.h
index a181cad..b965e2c 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -7,11 +7,10 @@ extern "C" {
 
 #include <stddef.h>
 #include <stdint.h>
-#include <stdatomic.h>
 
 /* C99 API. */
 
-typedef volatile atomic_int sig_atomic_t;
+typedef int sig_atomic_t;
 
 /* Type of a signal handler.*/
 typedef void (*__sighandler_t)(int);